diff --git a/go.mod b/go.mod
index 21d74e4..f9ea725 100644
--- a/go.mod
+++ b/go.mod
@@ -10,7 +10,7 @@ require (
 	github.com/henvic/pgq v0.0.2
 	github.com/jackc/pgx-gofrs-uuid v0.0.0-20230224015001-1d428863c2e2
 	github.com/jackc/pgx/v5 v5.7.1
-	github.com/mailgun/mailgun-go/v4 v4.12.0
+	github.com/mailgun/mailgun-go/v4 v4.15.0
 	github.com/stretchr/testify v1.9.0
 	github.com/testcontainers/testcontainers-go v0.33.0
 	github.com/testcontainers/testcontainers-go/modules/postgres v0.33.0
diff --git a/go.sum b/go.sum
index dd3bc9f..4906a12 100644
--- a/go.sum
+++ b/go.sum
@@ -196,8 +196,8 @@ github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 h1:6E+4a0GO5zZEnZ
 github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0/go.mod h1:zJYVVT2jmtg6P3p1VtQj7WsuWi/y4VnjVBn7F8KPB3I=
 github.com/magiconair/properties v1.8.7 h1:IeQXZAiQcpL9mgcAe1Nu6cX9LLw6ExEHKjN0VQdvPDY=
 github.com/magiconair/properties v1.8.7/go.mod h1:Dhd985XPs7jluiymwWYZ0G4Z61jb3vdS329zhj2hYo0=
-github.com/mailgun/mailgun-go/v4 v4.12.0 h1:TtuQCgqSp4cB6swPxP5VF/u4JeeBIAjTdpuQ+4Usd/w=
-github.com/mailgun/mailgun-go/v4 v4.12.0/go.mod h1:L9s941Lgk7iB3TgywTPz074pK2Ekkg4kgbnAaAyJ2z8=
+github.com/mailgun/mailgun-go/v4 v4.15.0 h1:3NQU0r2XItJbyIZ21iBI9ps0+vPIMoGyI2XK7ZTN/DQ=
+github.com/mailgun/mailgun-go/v4 v4.15.0/go.mod h1:L9s941Lgk7iB3TgywTPz074pK2Ekkg4kgbnAaAyJ2z8=
 github.com/mattn/go-colorable v0.1.1/go.mod h1:FuOcm+DKB9mbwrcAfNl7/TZVBZ6rcnceauSikq3lYCQ=
 github.com/mattn/go-colorable v0.1.6/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
 github.com/mattn/go-isatty v0.0.5/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=